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Proceedings Paper

Phthalocyanine molecules with extremely strong two-photon absorption for 3D rewritable optical information storage
Author(s): M. Drobizhev; N. S. Makarov; A. Rebane; H. Wolleb; H. Spahni
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Paper Abstract

Phthalocyanines (Pcs) show exceptional stability against high temperatures (up to 900°C, for certain metallophthalocyanines), harsh chemical environments (strong acids and bases), γ-radiation (up to 100 MRad) and neutron radiation (up to 1019 thermal neutrons/cm2). On the other hand, Pcs exhibit a number of unique physical properties, including semi-conductivity, photoconductivity, large linear and nonlinear optical coefficients, and the ability of photo-switch between two different forms, in case of non-symmetrical metal-free Pcs. This has led to an advancement of phthalocyanine-based prototype field-effect transistors, gas- and photo-sensors, solar cells, optical power limiters, and optical memory devices (CDs). For increasing the capacity of carriers of information, it has been suggested to use the effect of simultaneous two-photon absorption (2PA), which can allow for writing and reading information in many layers, thus resulting in Terabyte (TB) disks. Our estimation of the signal-to-noise ratio shows, however, that for fast (MB/s) processing, molecular 2PA cross section must be extremely large, σ2 > 103 - 104 GM (1GM = 10-50 cm4 s), which has not been achieved yet in any photochromic material. In this paper we demonstrate, for the first time, that some specially designed non-symmetric metal-free phthahlocyanines are almost ideally suited for TB rewritable memory due to their extremely high, resonantly enhanced, 2PA cross section (~ 104 GM) in near-IR region and their intrinsic ability of reversible photo-tautomerization at lowered (~ 100 K) temperatures. We discuss how the special technical specifications, such as short pulse laser excitation and lowered working temperature, can be satisfied for space and terrestrial application.

Paper Details

Date Published: 29 August 2006
PDF: 8 pages
Proc. SPIE 6308, Photonics for Space Environments XI, 630803 (29 August 2006); doi: 10.1117/12.683506
Show Author Affiliations
M. Drobizhev, Montana State Univ. (United States)
N. S. Makarov, Montana State Univ. (United States)
A. Rebane, Montana State Univ. (United States)
H. Wolleb, Ciba Specialty Chemicals Inc. (Switzerland)
H. Spahni, Ciba Specialty Chemicals Inc. (Switzerland)

Published in SPIE Proceedings Vol. 6308:
Photonics for Space Environments XI
Edward W. Taylor, Editor(s)

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